Answer :
Final answer:
The number of neutrons in a gold atom with a mass number of 197, we subtract the atomic number (79) from the mass number (197), giving 118 neutrons.
Explanation:
To calculate the number of neutrons in an atom, we subtract the atomic number (protons) from the mass number (protons + neutrons). In the case of gold with an atomic number of 79 and a mass number of 197 for one of its isotopes, the calculation would be 197 (mass number) - 79(atomic number). So the correct answer is (c) 118 neutrons.
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